From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graphical chart recording of an electrical test, possibly a battery discharge test, with calculated results.
| Identifier | ExFiles\Box 54\1\ Scan155 | |
| Date | 21th December 1925 | |
| 21-12-25 175 P&R RRII-2 103 lbs 75 a.h. Average amperes = 6.49 Hours = 8.75 Ampere hours = 56.8 1552 1.80w REGd TRADE MARK 'MEGGER' | ||